A cleaning oil recovery device for axle housing production

Abstract

The present application relates to the technical field of shaft shell production and processing, and discloses a cleaning oil recovery device for shaft shell production, which comprises an equipment base frame, an equipment cover, a cleaning rolling barrel, a servo drive assembly, an oil storage box, an oil conveying and spraying mechanism, an inclined recovery shell, an oil return pipe, a multi-stage filter assembly and an electric control box; the recovery shell adopts an inclined structure with a high feeding side and a low discharging side, and a preliminary filter plate is arranged at the top of the inner cavity; the bottom of the vertical L-shaped bend pipe of the oil return pipe is provided with a filter assembly, which comprises a connecting assembly, a control valve, a collection box, a suction backflow unit, a filter element, a magnetic attraction accessory and a filter core, and forms a four-stage gradient filtration system. The present application significantly improves the oil purification effect through multi-stage gradient filtration, avoids the wear of the pump body caused by metal debris, realizes non-stop maintenance through the use of a quick-mounting filter structure, and greatly improves the operation stability and operation and maintenance efficiency of the device through the cooperation of the inclined gravity recovery and liquid level protection mechanism, and is suitable for the oil circulation recovery of batch cleaning of shaft shells.

Description

Technical Field

[0001] This invention relates to the field of shaft housing production and processing technology, and in particular to a cleaning oil recovery device for shaft housing production. Background Technology

[0002] In the machining process of the shaft housing, after turning, milling and other processes, a large amount of metal shavings, cutting oil and machining impurities will be attached to the surface of the shaft housing. It is necessary to use cleaning oil for rolling cleaning to ensure the subsequent assembly accuracy and surface quality.

[0003] The existing oil recovery systems of shaft housing cleaning equipment generally have the following defects: the filtration stage is single, and only a single layer of filter screen is used for coarse filtration. Fine metal debris can easily penetrate the filter screen and enter the circulating oil circuit. Long-term operation will wear down the pump body and seals of the delivery pump and return pump, which will significantly shorten the service life of the equipment. Oil recovery tanks are mostly horizontal structures, resulting in slow oil flow, easy accumulation of impurities at the bottom, insufficient oil recovery, and potential pipeline blockage. Therefore, this paper proposes a cleaning oil recovery device for shaft housing production. Summary of the Invention

[0004] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide a cleaning oil recovery device for shaft housing production, which solves the problems of incomplete filtration, difficult maintenance and poor operation stability of existing cleaning oil recovery devices by means of a multi-stage gradient filtration system, quick-installation filter components, inclined recovery structure and integrated electronic control system.

[0005] The present invention is achieved by the following technical solution: a cleaning oil recovery device for shaft housing production, comprising a base frame, a cover, a cleaning drum, a servo motor, a belt drive assembly, an oil storage box, an oil delivery pipe, a return pipe, a filter assembly, and an electrical control box; The equipment base frame serves as the main support for the device. It has an inlet on one side for feeding the shaft housing to be cleaned, an outlet on the other side for discharging the cleaned shaft housing, and an openable observation window on the front. A recovery shell is inclinedly installed at the bottom of the inner cavity of the equipment base frame, with the end of the recovery shell near the inlet being higher than the end near the outlet. Multiple filter plates for preliminary filtration are detachably laid on the top of the inner cavity of the recovery shell. The cleaning drum is a stirring bearing structure for shaft housing cleaning. It is rotatably installed in the inner cavity of the equipment base frame via a shaft. A gap is left between the lowest point of the bottom of the cleaning drum and the top of the filter plate. The equipment cover is a sealing structure above the cleaning drum. It is detachably installed on the top of the equipment base frame by bolts and covers the cleaning drum to prevent cleaning oil from splashing. The servo motor is the driving component of the cleaning drum and is fixed to the top of the equipment cover near the discharge port by bolts; the belt drive assembly is connected between the shaft of the cleaning drum and the drive shaft of the servo motor to transmit driving force and drive the cleaning drum to rotate. The oil storage box is located at the rear of the equipment base and is used to store cleaning oil. A pressure sensor is installed on the top of the oil storage box to calculate the oil level by detecting the internal pressure. A delivery pump is installed on one side of the oil storage box. The input end of the delivery pump extends into the inner cavity of the oil storage box through a hose, and the output end is connected to an oil delivery pipe. The top end of the oil delivery pipe passes through the top of the equipment cover, and the end is connected to an oil spray pipe with an oil drain hole. The oil spray pipe is located in the inner cavity of the equipment cover and leaves a gap with the highest point of the cleaning drum. The return oil pipe is connected between the end of the recovery shell near the discharge port and the oil storage box. A return oil pump is installed at the connection between the return oil pipe and the oil storage box. The vertical right-angle section of the return oil pipe is an L-shaped bend, and the horizontal section is a straight pipe. The L-shaped bend and the straight pipe are connected by a flange. Each L-shaped bend has an internally threaded installation pipe at its bottom. Each installation pipe is equipped with a filter assembly to intercept metal debris in the oil. The filtration assembly includes a connecting assembly, a control valve, a collection box, a suction pump, a suction pipe, a filter element, a filter component, a compression spring, and an adsorption component. The connecting assembly is threaded onto the mounting pipe at the bottom of the L-shaped bend, the control valve is threaded onto the bottom of the connecting assembly, and the collection box is threaded onto the bottom of the control valve; the suction pump is threaded onto the mounting pipe at the bottom of the straight pipe, the suction pipe connects the suction pump and the collection box, and the filter element is detachably installed in the middle of the suction pipe. The filter element is installed in the inner cavity of the connecting assembly and extends into the inner cavity of the L-shaped bend. The compression spring is located in the inner cavity of the connecting assembly and between the filter element and the control valve, and presses and limits the filter element by elastic force. The adsorption element is installed inside the connection port between the collection box and the control valve by threads. The electrical control box is bolted to the rear of the equipment base frame and is electrically connected to the servo motor, delivery pump, return oil pump, suction pump, and pressure sensor, respectively, to control the start-up, shutdown, and operating status of each power component.

[0006] Furthermore, the connecting assembly includes an integrally formed connecting sleeve and a connecting pipe; the outer wall of the connecting pipe is provided with an external thread that matches the mounting pipe, and the inner cavity of the end of the connecting sleeve away from the connecting pipe is provided with a connecting thread that matches the control valve; the inner wall of the cavity formed by the connecting sleeve and the connecting pipe is uniformly provided with guide grooves, and the outer wall of the connecting sleeve is provided with an alignment arrow; when the alignment arrow coincides with the scale line on the L-shaped bend, the filter element is in a working state of completely intercepting oil.

[0007] Furthermore, the filter element includes a limiting ring, a barrier ring, and a filter screen; the barrier ring is made of a flexible, oil-resistant material and is integrally formed with the limiting ring, and the filter screen is integrally set in the inner cavity of the barrier ring; the outer wall of the limiting ring is uniformly provided with limiting balls that match the guide groove, and the limiting balls are locked in the guide groove to restrict the circumferential rotation of the filter element.

[0008] Furthermore, the adsorption component includes a support ring, a spiral guide plate, and a magnetic rod; the outer wall of the support ring is provided with external threads and is installed in the inner cavity of the oil inlet of the collection box; the spiral guide plate and the support ring are integrally injection molded, and the magnetic rod is inserted into the center of the support ring and the spiral guide plate.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention forms a four-stage filtration system consisting of "coarse filtration by filter plate → secondary interception by filter element → magnetic adsorption by adsorption element → final purification by filter element". It can remove metal debris of different particle sizes step by step, completely prevent impurities from entering the pump body, and effectively extend the service life of the delivery pump and return pump. The filter assembly of this invention adopts a threaded quick-connect structure. With the help of the control valve, the collection box can be disassembled, debris cleaned and filter element replaced independently without disassembling the main return oil pipeline or interrupting the operation of the overall equipment, which significantly reduces maintenance difficulty and downtime. The present invention adopts an inclined arrangement of the recovery shell with the feed side higher and the discharge side lower, and uses gravity to guide the oil to automatically collect at the return port, avoiding the deposition of oil and debris at the bottom of the tank, improving the oil recovery efficiency, and reducing the risk of pipeline blockage. Attached Figure Description

[0010] Figure 1 This is a three-dimensional perspective view of the present invention from the frontal view. Figure 2 This is a three-dimensional perspective view of the invention from the rear view direction; Figure 3 This is a three-dimensional perspective view of the device cover in a semi-sectional state from the frontal view of the present invention. Figure 4 This is a three-dimensional perspective view of the present invention in a half-section state viewed from the front. Figure 5 This is a three-dimensional perspective view of the L-shaped bend, straight pipe and filter assembly of the present invention in combination. Figure 6 This is a three-dimensional perspective view of the L-shaped bend, straight pipe and filter assembly of the present invention in a semi-sectional state. Figure 7 This is a three-dimensional perspective view of the connecting components, filter element, and compression spring of the present invention; Figure 8 This is a three-dimensional representation of the adsorption component of the present invention.

[0011] Explanation of key symbols: 1. Equipment base frame; 11. Feed inlet; 12. Discharge outlet; 13. Observation window; 14. Filter plate; 15. Recovery shell; 2. Equipment cover; 3. Cleaning drum; 4. Servo motor; 5. Belt drive assembly; 6. Oil storage box; 7. Oil delivery pipe; 71. Conveying pump; 72. Oil spray pipe; 8. Oil return pipe; 81. Oil return pump; 82. L-shaped bend; 83. Straight pipe; 9. Filter assembly; 91. Connecting assembly; 911. Connecting sleeve 912. Cylinder; 913. Connecting pipe; 914. Connecting thread; 915. Guide groove; 92. Control valve; 93. Collection box; 94. Suction pump; 95. Suction pipe; 96. Filter element; 97. Filter element; 971. Limiting ring; 972. Barrier ring; 973. Filter screen; 974. Limiting ball; 98. Compression spring; 99. Adsorption element; 991. Support ring; 992. Spiral guide plate; 993. Magnetic rod; 10. Electrical control box. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0013] Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0014] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0015] To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted.

[0016] Please combine Figure 1-8As shown in the figure, an embodiment of the present invention provides a cleaning oil recovery device for shaft housing production, comprising: equipment base frame 1, equipment cover 2, cleaning drum 3, servo motor 4, belt drive assembly 5, oil storage box 6, oil delivery pipe 7, oil return pipe 8, filter assembly 9, and electrical control box 10. The equipment base frame 1 is made of welded steel and serves as the main support for the entire device. The left side of the equipment base frame 1 is provided with a feed inlet 11, through which the shaft housing to be cleaned is fed into the internal cleaning station. The right side is provided with a discharge outlet 12, through which the cleaned shaft housing is discharged to the next process. The front side of the equipment base frame 1 is inlaid with an openable observation window 13, which allows the staff to observe the internal cleaning status and the clogging of the filter plate 14 when the cover is open. A recovery shell 15 is fixedly installed at the bottom of the inner cavity of the equipment base frame 1. The recovery shell 15 is arranged with the left side higher than the right side (the side with the inlet 11 is higher and the side with the outlet 12 is lower), with an inclination angle of 5°~8°. The oil is automatically guided to the right oil return port by gravity to avoid the oil and metal debris from settling at the bottom of the tank. The top inner wall of the recovery shell 15 is provided with a support step, and multiple strip filter plates 14 are laid flat and snapped onto the support step to form a preliminary filter layer. The filter plates 14 are perforated metal plates that can be directly removed for cleaning, making disassembly and assembly convenient. The cleaning drum 3 is a hollow drum structure, which is rotatably mounted in the inner cavity of the equipment base frame 1 via shafts at both ends. The lowest point of the bottom of the cleaning drum 3 maintains a gap of 50~80mm with the top of the filter plate 14 to avoid friction with the filter plate 14 during rotation. The shaft housing is placed inside the cleaning drum 3 and tumbles continuously with the drum rotation to achieve all-round cleaning. The equipment cover 2 has an arc-shaped structure. The bottom is connected to the top flange of the equipment base frame 1 by bolts and is fastened on the top of the cleaning drum 3. The contact surface between the equipment cover 2 and the equipment base frame 1 is provided with an oil-resistant sealing strip to form a closed cleaning chamber, preventing the cleaning oil from being splashed to the outside of the equipment when the cleaning drum 3 rotates, and reducing oil evaporation. The servo motor 4 is fixed to the right side of the top of the equipment cover 2 (near the discharge port 12) by motor mount bolts; the belt drive assembly 5 includes a driving pulley, a driven pulley, and a synchronous drive belt. The driving pulley is fixedly installed on the output shaft end of the servo motor 4, and the driven pulley is fixedly installed on the shaft end of the cleaning drum 3. The drive belt is sleeved between the two pulleys. When the servo motor 4 is powered on and rotates, it drives the cleaning drum 3 to rotate at a uniform speed through the belt drive assembly 5. The transmission process is smooth and has a buffering and shock absorption effect. The oil storage box 6 is a sealed box, which is fixedly installed on the rear side of the equipment base frame 1 and contains cleaning oil. A pressure sensor is installed on the top of the oil storage box 6, which can detect changes in air pressure inside the box and convert them into the liquid level of the cleaning oil through a preset algorithm, so as to realize real-time monitoring of oil volume. A delivery pump 71 is fixedly installed on the outer wall of the oil storage box 6. The oil inlet end of the delivery pump 71 extends into the bottom of the inner cavity of the oil storage box 6 through an oil-resistant hose, and the oil outlet end is connected to the oil delivery pipe 7. The oil delivery pipe 7 extends upward and passes through the top wall of the equipment cover 2, and the end is connected to a horizontally arranged oil spray pipe 72. Multiple oil discharge holes are evenly opened at the bottom of the pipe wall of the oil spray pipe 72, which can evenly spray the cleaning oil onto the surface of the shaft housing inside the cleaning drum 3. The lowest point of the oil spray pipe 72 maintains a safe gap with the highest point of the cleaning drum 3 to avoid interference with the rotating drum. The lowest end of the recovery shell 15 (the end near the discharge port 12) is connected to the return oil pipe 8, and the end of the return oil pipe 8 is connected to the oil storage box 6. A return oil pump 81 is connected in series on the pipe to provide power for the return of oil. The return oil pipe 8 is composed of multiple L-shaped bends 82 and straight pipes 83 spliced ​​together, with adjacent pipe sections sealed by flanges; each vertical right-angle bend uses an L-shaped bend 82, and the bottom of the vertical section of the L-shaped bend 82 is integrally formed with an installation pipe with internal threads, and each set of installation pipes is equipped with a set of filter components 9; taking advantage of the characteristics of reduced flow velocity and easy sedimentation at right angles in the pipeline, a filter structure is set up at this point to improve the filtration and interception efficiency; The filter assembly 9 consists of a connecting assembly 91, a control valve 92, a collection box 93, a suction pump 94, a suction pipe 95, a filter element 96 (suction filtration), a filter element 97 (blocking filtration), a compression spring 98, and an adsorption element 99 (adsorption filtration). The specific structure and assembly relationship are as follows: Connection component 91: includes a coaxially integrated connection sleeve 911 and a connection pipe 912. The outer wall of the connection pipe 912 is machined with external threads to connect with the mounting pipe thread at the bottom of the L-shaped bend 82. The lower end of the connection sleeve 911 has a connection thread 913 machined in its inner cavity for connecting with the control valve 92. Multiple axial guide grooves 914 are evenly opened along the circumference on the inner wall of the connection sleeve 911, and alignment arrows are engraved on the outer wall. During installation, the connection component 91 is rotated. When the arrow is aligned with the scale line on the outer wall of the L-shaped bend 82, the filter element 97 is in a working state of completely sealing the pipeline section. Filter element 97: Composed of a limiting ring 971, a barrier ring 972, and a filter screen 973; the barrier ring 972 is made of flexible, oil-resistant plastic and is integrally injection molded with the rigid limiting ring 971; the filter screen 973 is fixedly embedded in the inner ring of the barrier ring 972. Multiple limiting balls 974 are evenly arranged circumferentially on the outer wall of the limiting ring 971. Each limiting ball 974 is inserted into a guide groove 914, serving both as a guide during installation and preventing circumferential rotation of the filter element 97. During installation, the flexible barrier ring 972 can be slightly rolled up and inserted into the inner cavity of the L-shaped bend 82 along with the connecting component 91. After entering the pipeline, it automatically springs back and unfolds, fitting against the inner wall of the bend, so that the filter screen 973 completely covers the oil flow section and intercepts metal debris in the oil. The compression spring 98 is sleeved below the filter element 97, with its upper end abutting against the limit ring 971 and its lower end abutting against the top of the control valve 92. The spring force presses the filter element 97 upward to compensate for the installation gap and prevent oil from bypassing and leaking through the side gap. Control valve 92 and collection box 93: The upper end of control valve 92 is threaded to connecting sleeve 911, and the lower end is threaded to collection box 93; During normal operation, control valve 92 remains open, and metal debris intercepted by filter screen 973 settles with the oil, passing through connecting assembly 91 and control valve 92 in sequence before falling into collection box 93 below; When cleaning and maintenance are required, closing control valve 92 will block the connection between the main return oil pipeline and collection box 93, and collection box 93 can be unscrewed for debris cleaning, without disassembling the main return oil pipeline or stopping the machine; Adsorption component 99: Installed inside the oil inlet of the collection box 93, it consists of a support ring 991, a spiral guide plate 992, and a magnetic rod 993. The support ring 991 has external threads on its outer wall and is screwed and fixed at the oil inlet of the collection box 93; the spiral guide plate 992 extends spirally along the axial direction and is integrally formed with the support ring 991, with a cylindrical magnetic rod 993 inserted in the center; When the oil carrying fine debris enters the collection box 93, it flows downward in a spiral shape along the spiral guide plate 992, which prolongs the contact path and contact time between the oil and the magnetic rod 993. Under the magnetic force of the magnetic rod 993, the fine ferromagnetic metal debris in the oil is adsorbed and retained, realizing the third stage of fine filtration. Suction and return unit: The suction pump 94 is threaded onto the mounting pipe at the bottom of the straight pipe 83. The suction pipe 95 connects the oil inlet end of the suction pump 94 to the oil outlet end of the collection box 93. A replaceable filter element 96 is connected in series in the middle of the suction pipe 95. The oil in the collection box 93, after being magnetically adsorbed, flows back to the straight pipe 83 of the return oil pipe 8 through the suction pipe 95 under the negative pressure of the suction pump 94. During the return process, the oil undergoes final filtration through the filter element 96 to completely remove residual micro-impurities and ensure the cleanliness of the returned oil. The electrical control box 10 is bolted to the rear outer wall of the equipment base frame 1, and integrates a PLC controller, operation panel, and wiring terminals. The electrical control box 10 is electrically connected to the servo motor 4, the delivery pump 71, the return oil pump 81, the suction pump 94, and the pressure sensor, and can perform the following functions: Control the start, stop and speed of servo motor 4 to adapt to the cleaning needs of shaft housings of different specifications; The coordinated start and stop of the transfer pump 71, return pump 81, and suction pump 94 are controlled to ensure stable oil circulation; The system receives the liquid level signal from the pressure sensor. When the oil level in the oil storage box 6 is lower than the safety threshold, it triggers an audible and visual warning and automatically stops the delivery pump 71 to prevent the pump body from being damaged by dry pumping.

[0017] Device operation process Cleaning stage: The shaft housing to be cleaned is fed into the cleaning drum 3 through the feed port 11. The servo motor 4 is started and drives the cleaning drum 3 to rotate at a constant speed through the belt drive assembly 5. The shaft housing tumbles continuously with the drum. At the same time, the delivery pump 71 is started and pumps the cleaning oil in the oil storage box 6 to the oil spray pipe 72 through the oil delivery pipe 7. The oil is evenly sprayed on the surface of the shaft housing to wash away the metal debris and oil stains on the surface.

[0018] Recovery and filtration stage: The cleaning oil after spraying carries impurities and falls down. It first undergoes coarse filtration through filter plate 14 to intercept large-sized debris and impurities. The preliminarily purified oil falls into the recovery shell 15, collects along the inclined surface at the oil return port, and enters the oil return pipe 8.

[0019] As the oil flows through the L-shaped bend 82, medium-sized debris is intercepted by the filter screen 973 of the filter element 97. The debris settles with the oil and enters the collection box 93. Inside the collection box 93, the oil flows along the spiral guide plate 992, and fine ferromagnetic debris is attracted by the magnetic rod 993. Subsequently, the suction pump 94 draws the oil back to the main oil return line through the suction pipe 95, completing the final purification process through the filter element 96. The finally cleaned recovered oil is then transported back to the oil storage box 6 by the return oil pump 81, completing the full oil recycling cycle.

[0020] Maintenance phase: When it is necessary to clean debris or replace the filter element, close the control valve 92 of the corresponding pipeline, unscrew the collection box 93 to clean the internal debris, or replace the adsorption element 99 and filter element 96; after the operation is completed, reinstall them and open the control valve 92 to restore normal operation. The filter plate 14 can be directly removed for cleaning after opening the equipment cover 2.

[0021] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A cleaning oil recovery device for shaft housing production, characterized in that, It includes a base frame (1), a cover (2), a cleaning drum (3), a servo motor (4), a belt drive assembly (5), an oil storage box (6), an oil delivery pipe (7), an oil return pipe (8), and a filter assembly (9); The equipment base frame (1) is the main support body of the device. The bottom of the inner cavity of the equipment base frame (1) is provided with a recycling shell (15) and multiple filter plates (14) for preliminary filtration. The cleaning drum (3) is rotatably installed in the inner cavity of the equipment base frame (1); the equipment cover (2) is detachably installed on the top of the equipment base frame (1) and covers the cleaning drum (3) to prevent cleaning oil from splashing. The servo motor (4) is fixed on one side of the top of the equipment cover (2); the belt drive assembly (5) is connected between the shaft of the cleaning drum (3) and the drive shaft of the servo motor (4) to transmit driving force to drive the cleaning drum (3) to rotate. The oil storage box (6) is located on the rear side of the equipment base frame (1) and is used to store cleaning oil; the oil delivery pipe (7) is installed between the oil storage box (6) and the equipment cover (2); The return oil pipe (8) is connected between the end of the recovery shell (15) and the oil storage box (6); the vertical right-angle section of the return oil pipe (8) is an L-shaped bend (82); a set of filter components (9) is set at the bottom of each L-shaped bend (82), and the filter components (9) are equipped with a three-stage filtration system; the filter components (9) are used to filter the metal debris in the oil entering the return oil pipe (8); A four-stage filtration system consisting of filter plates (14) and filter components (9) can remove metal debris of different particle sizes step by step.

2. The cleaning oil recovery device for shaft housing production as described in claim 1, characterized in that, A delivery pump (71) is provided on one side of the oil storage box (6). The input end of the delivery pump (71) extends into the inner cavity of the oil storage box (6), and the output end is connected to the oil delivery pipe (7). The top of the oil delivery pipe (7) passes through the top of the equipment cover (2), and the end is connected to an oil spray pipe (72) with an oil drain hole. The oil spray pipe (72) is located in the inner cavity of the equipment cover (2) and has a gap with the highest point of the cleaning drum (3).

3. The cleaning oil recovery device for shaft housing production as described in claim 2, characterized in that, A return oil pump (81) is provided at the connection between the return oil pipe (8) and the oil storage box (6); the vertical right-angle section of the return oil pipe (8) is an L-shaped bend (82), and the horizontal section is a straight pipe (83), and the L-shaped bend (82) and the straight pipe (83) are connected by a flange; each L-shaped bend (82) is provided with an internally threaded installation pipe at the bottom, and each installation pipe is detachably connected by a threaded filter assembly (9).

4. The cleaning oil recovery device for shaft housing production as described in claim 3, characterized in that, The filter assembly (9) includes a connection assembly (91), a control valve (92), a collection box (93), a suction pump (94), a suction pipe (95), a filter element (96), a filter element (97), a compression spring (98), and an adsorption element (99). The connecting assembly (91) is installed on the mounting pipe at the bottom of the L-shaped bend (82), the control valve (92) is installed at the bottom of the connecting assembly (91), and the collection box (93) is installed at the bottom of the control valve (92); The suction pump (94) is installed on the mounting pipe at the bottom of the straight pipe (83), the suction pipe (95) is connected between the suction pump (94) and the collection box (93), and the filter element (96) is detachably installed in the middle of the suction pipe (95). The filter element (97) is installed in the inner cavity of the connecting assembly (91) and extends into the inner cavity of the L-shaped bend (82). The compression spring (98) is located in the inner cavity of the connecting assembly (91) and between the filter element (97) and the control valve (92), and presses and limits the filter element (97) by elastic force. The adsorption element (99) is installed inside the connection port between the collection box (93) and the control valve (92). Under the negative pressure of the suction pump (94), the oil flows back through the suction pipe (95) to the straight pipe (83) of the return oil pipe (8); during the return process, the oil undergoes final filtration through the filter element (96) to completely remove residual micro-impurities and ensure the cleanliness of the returned oil.

5. The cleaning oil recovery device for shaft housing production as described in claim 4, characterized in that, The connecting assembly (91) includes an integrally formed connecting sleeve (911) and a connecting pipe (912); the outer wall of the connecting pipe (912) is provided with an external thread that matches the mounting pipe, and the inner cavity of the end of the connecting sleeve (911) away from the connecting pipe (912) is provided with a connecting thread (913) that matches the control valve (92). The inner wall of the cavity formed by the connecting sleeve (911) and the connecting pipe (912) is uniformly provided with guide grooves (914), and the outer wall of the connecting sleeve (911) is provided with alignment arrows; when the alignment arrows coincide with the scale lines on the L-shaped bend (82), the filter element (97) is in a working state of completely intercepting oil.

6. The cleaning oil recovery device for shaft housing production as described in claim 5, characterized in that, The filter element (97) includes a limiting ring (971), a barrier ring (972), and a filter screen (973); the barrier ring (972) is made of a flexible, oil-resistant material and is integrally formed with the limiting ring (971); the filter screen (973) is integrally set in the inner cavity of the barrier ring (972); the outer wall of the limiting ring (971) is uniformly provided with limiting balls (974) that match the guide groove (914); the limiting balls (974) are locked in the guide groove (914) to restrict the circumferential rotation of the filter element (97); The flexible barrier ring (972) can be slightly rolled up and extended into the inner cavity of the L-shaped bend (82) together with the connecting component (91). After entering the pipeline, it automatically rebounds and unfolds, fitting the inner wall of the bend, so that the filter screen (973) completely covers the oil flow section and intercepts metal debris in the oil.

7. The cleaning oil recovery device for shaft housing production as described in claim 4, characterized in that, The adsorption component (99) includes a support ring (991), a spiral guide plate (992), and a magnetic rod (993); the outer wall of the support ring (991) is provided with external threads and is installed in the inner cavity of the oil inlet of the collection box (93); the spiral guide plate (992) and the support ring (991) are integrally injection molded, and the magnetic rod (993) is inserted into the center of the support ring (991) and the spiral guide plate (992); When the oil carrying fine debris enters the collection box (93), it flows downward in a spiral shape along the spiral guide plate (992), which prolongs the contact path and contact time between the oil and the magnetic rod (993). Under the magnetic force of the magnetic rod (993), the fine ferromagnetic metal debris in the oil is adsorbed and retained, thus achieving the third stage of fine filtration.

8. The cleaning oil recovery device for shaft housing production as described in claim 4, characterized in that, It also includes an electrical control box (10), which is installed on the rear side of the equipment base frame (1) and is electrically connected to the servo motor (4), the delivery pump (71), the return oil pump (81), the suction pump (94), and the pressure sensor, respectively, for controlling the start-up and operation status of each power component.

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